Suction producing device



A. C. NELSON SUCTION PRODUCING DEVICE 5 July 26, 1932.

Filed Nov. 15, 1928 V INVENTOR 4 22 arewC/Velw n ATTORN Y Patented July26, 1932 UNHTED STATE-s- ANDREW c. nELson, orroR'rLAnn, onneonsucrronritonucine nnvrcn T Application fildNovember 15 192B swarm.319302.

My invention relates to suction producing devices and particularly tothose of thejet type by which fluids are sucked into such 'device byreason of the reduced pressure therein and forced out of such devicebythe velocity of the jet which produces such' reduced pressures. x

The particular object of my -invention is to provide a device of thischaracter capable of producing a relatively high reduced pressure, onecapable of being set to the desired pressures over a relatively widerange, and one which is adapted to maintain such predetermined reducedpressure Without intermission and without fluctuation.

I attain this object by providing a nozzle capable of emitting ajetofrelativelyhigh contraction and with a relatively large degree ofsurface agitation and aline an outlet with such nozzle in such a mannerthat the jet discharged into the latter is arranged to expand andcompletely fill such discharge opening and the agitated surface ofsuchjet is adaptedto be received in the flared mouth of such opening to sealthe same and prevent variations and reduced pressures. The dischargeoutlet is further sealed by a secondary flared portion of lesserinclination thansuch primary flared mouth, which second flared portionis adapted to receive and hold a portion of the liquid from such jet'inrelative quiescence. p

The details of my invention and the mode ofoperation thereof arehereinafter described with reference to the accompanying drawing, inwhich:

Fig. 1 is a section thru such apparatus; and

Fi g. 2 is a larger scaled diagrammaticillustration of the relativealinement of such nozzle and the discharge outlet for the-jet emittedfrom such nozzle.

Such'apparatus comprises a body a defining a spherical chamber a withinsuch body.

A nozzle Z2 enters thru the sides of such body a and is screw-threadedtherein at c v to provide a fluid-tight joint. In the mouth of suchnozzle Z) a tip (Z is arranged, which restricts the size of the jetorificesubstantially. Such tip d is relatively narrow and the innerchamber. The inlet openingg is arranged mouth of such nozzle.

of an'inch in diameter and a discharge [opening [use of an inch indlameter, the tlp corner d th re f sharp to produce a "jet comparable toa square-ring fire nozzle, which 7, produces a jet of relatively highcontraction U a and "has the peculiarcharacteristic of having the outerportion of the jet broken up into minute particles. A supply pipe 6provided with an adjustable valve. f is connected to such nozzle be Aninlet pipeg admits the fluid to'be propelled thru the inlet opening, g".The nozzle 5 isarranged to extend in a vertical plane'and diametricallythrufithe chamber a, the orifice of such nozzle being arranged inv closeproximity to the bottom of such in a horizontal plane substantiallynormal to theplane of such nozzleand enters thru the wall of the body arearwardlyof the The discharge opening/r from such chamher a is, in themain, of uniform diameter. and'is proportioned relatively to the bore032 of the-nozzle tipd. That is; in one size device I provide a nozzletip having a bore being arranged "of an inch from the mouth ofsuch boreand in exact alinementtherewith, the nozzle tip being about of an" inch1 thick. I- find that the jet produced by such :nozzle tip will expandand will strike the surface and completely fill the discharge opening hata' point substantially {a of an; inch below itsmouth. Above suchpoint,

namely'fg of an inch below the" innersurface V of thebody ayif continuedin a line across the mouth of, such discharge outlet h, '1 flare suchdischarge outlet at an angle substantial- 1y 30 from the axis of suchopening it, such flared portion being referred to in the drawing as 7i".About of-an inch inside'of.

such innersurface of the body a I produce a secondary flare h2fromJs1ichprimary flare h extending from the axis of such opening it approximatelyat an inclination of 60.

The'jet'producedby thenozzle 5 provided witha tip d has an outer surfacecomprising minutejwaterparticles which are directly forwarded by themain portion of the jet but diverge slightly therefrom. Th angle f liOOhaving a pipe y divergence of such outer broken up portion issufiicient, when the parts are proportioned as heretofore set out, tostrike the primary flared portion it slightly inwardly of the point 2'where the secondary flare 7L2 commenccs. ihe entire length of suchflared mouth bounded by the portion h is thus filled with such finelydivided particles of water or spray which move forwardly with the jetand tend to seal the same with the bore of the dischargeoutlet h. I

In the secondary flare bounded by the portion 752 relatively quiescentliquid collects, but which tends to drain into the outlet it. The forceof the finely divided liquid drawn against the flared mouth it seeminglyprevents the escape of the major portion of the liquid thus collectedand ii any does drain od into such opening it is immediately replaced.

A characteristic of such apparatus thus described is the relatively highvacuum produced when the inlet opening 9 is closed to prevent fluid frombeing drawn into the chamber a. I have been able to produce conditionsof reduced pressure equal to 29 inches ofmcrcury, such devices beingcapable of sustaining unvarying reduced pressures from atmosphericpressure to such relatively high reduced pressures, merely by varyingthe fluid pressure in the supply pipe for the nozzle Z). a

To check the reduction in pressures within the chambera I provide apressure gauge y' opening intotthe chamber at 70. l i

I claim: 7 V

1. In a device ofthe character described comprising a casing defining achamber, intake and discharge openings communicating with such chamberand entering thru the ed in the tip of suchnozzle and adapted tocontract the discharging stream emitted from such nozzle, the bore ofsuch flange being of a size corresponding approximately to one-half ofthe thickness thereof and the bore of such discharge opening beingspaced from the discharge opening a distance approximately four timesthe diameter of the aperture of the noz' zle, the mouth of suchdischarge opening being provided with a primary outwardly flaredportion.

3. In a device of the character described comprising a casing defining achamber, intake and discharge openings communicating with such chamberand entering thru the walls of such casing, and a liquid dischargenozzle also entering thru the walls of such casing and dependingcentrally into such chamber and alined with such discharge opening aninwardly projecting relatively thin circularly bored flange located inthe tip of such nozzle and adapted to contract the V discharging streamemlttedfrom such n0zzle, the bore of such flange and the bore of suchdischarge opening being proportioned and spaced 1n the manner described,the

mouth of such discharge opening being provided with a primary outwardlyflared por tion, and with; a basin-like secondary outing such primaryPOItlOIL In testimony whereof he affixes his signa wardly flared portionjoining and surroundwalls of? such casing, and a liquid discharge nozzlealso entering thru the walls of such casing and depending centrally intosuch chamber and alined with suchdlscharge opening, an inwardlyprojecting relatively thin I 7 sh arp-cornered. circularly bored flangelocated in the tip of such nozzle and adapted to contract thedischargingstream emitted from such nozzle, the bore of such flangebeing of a size corresponding approximately to onehalf of the thicknessthereof and the bore of such discharge opening being spaced from thedischarge opening a distance approximately four times the diameter ofthe aperture of the nozzle. l

2. In a device of the character described comprising a casing defining achamber, intake and discharge openings communicating with such chamberand entering thru the walls of such casin and a liquid discharge nozzlealso entering thru the walls of such ing, an inwardly projectingrelatively thin sharp-cornered, circularly bored fiangelocat-

